Understanding COVID-19 in TK-12 Schools in Los Angeles County

About the Data


School-based COVID-19 Testing in Los Angeles County

COVID-19 Weekly School Testing Volume and Test Positivity by Week, Los Angeles County Department of Public Health, data through 26 SEP 2021

  • Weekly data may include repeat tests for a unique individual.
  • School-based COVID-19 testing resources are provided by the American Rescue Plan Act of 2021 through the US Centers for Disease Control and Prevention Epidemiology and Laboratory Capacity for Prevention and Control of Emerging Infectious Diseases (ELC) Reopening Schools Award.



COVID-19 School Testing Volume by School District or School, Los Angeles County Department of Public Health, data between 20 SEP 2021 and 26 SEP 2021

  • School-based COVID-19 testing resources are provided by the American Rescue Plan Act of 2021 through the US Centers for Disease Control and Prevention Epidemiology and Laboratory Capacity for Prevention and Control of Emerging Infectious Diseases (ELC) Reopening Schools Award.
  • Weekly data may include repeat tests for a unique individual.
  • Missing values indicate that the district/school is in the planning phase of implementing their testing program under this award or may be delayed in reporting their weekly data.

COVID-19 Cases in TK-12 Schools

New COVID-19 Cases in the Past 7 Days by TK-12 Schools, Shown Both with COVID-19 District Vaccination Rates and District Case Rates, Los Angeles County Department of Public Health, Data Through 26 SEP 2021

Note that a school with one or more cases is not necessarily a school with ongoing transmission. Most identified cases are from community exposures unrelated to school.

With District Vaccination Rates
With District Case Rates
  • TK-12 schools are required to report all cases of laboratory-confirmed COVID-19 who were on campus within 14 days of their illness onset date to Public Health.
  • A school with one or more cases is not necessarily a school with ongoing transmission. As more districts and schools continue to implement school-based COVID-19 testing of asymptomatic and symptomatic individuals, the weekly number of COVID-19 tests conducted will increase, leading to increased identification of COVID-19 cases by schools.
  • Schools with 3 or more new cases in the past 7 days do not reflect school outbreaks unless posted in the outbreak table below.
  • Case counts are reported by earliest symptom onset date or positive COVID-19 test specimen collection date (illness onset date). If both dates are missing, the earliest of the isolation date or the date of case report is used.
  • Case counts include individuals who reside outside of Los Angeles County but attend, are employed by, or were visiting a school/program in Los Angeles County. School district COVID-19 case rates are calculated as the 7-day average number of COVID-19 cases residing within a Los Angeles County school district boundary divided by the population residing within the school district boundary, per by 100,000 persons.
  • School district COVID-19 vaccine rates are calculated as the percentage of vaccine eligible children aged 12-17 years who resided within a Los Angeles County school district boundary and received at least one dose of vaccine.
  • Data reported on COVID-19 cases may differ from the information managed at the district- or school-level due to the reporting time period and additional quality control conducted by Public Health staff.



Cumulative COVID-19 Cases in TK-12 Schools from 16 AUG 2021 to 26 SEP 2021

  • The cumulative count of COVID-19 cases is calculated as the total number of laboratory-confirmed COVID-19 diagnoses reported by the school to Public Health from August 9, 2021 to date.
  • A school with one or more cases is not necessarily a school with ongoing transmission. Most identified cases are from community exposures unrelated to school. As more districts and schools continue to implement school-based COVID-19 testing of asymptomatic and symptomatic individuals, the weekly number of COVID-19 tests conducted will increase, leading to increased identification of COVID-19 cases by schools.
  • Schools with 3 or more cases do not reflect school outbreaks unless posted in the outbreak table below.
  • Case counts are reported by earliest symptom onset date or positive COVID-19 test specimen collection date (illness onset date). If both dates are missing, the earliest of the isolation date or the date of case report is used.
  • Case counts include individuals who reside outside of Los Angeles County but attend, are employed by, or were visiting a school/program in Los Angeles County.
  • Data reported on COVID-19 cases may differ from the information managed at the district- or school-level due to the reporting time period and additional quality control conducted by Public Health staff.

COVID-19 Outbreaks in TK-12 Schools

A COVID-19 outbreak is opened when there are at least 3 or more laboratory-confirmed cases of COVID-19 within a 14-day period of each other in a specific group with members who epidemiologically-linked, do not share a household, and are not a close contact of each other outside of school. Out of over 3,000 schools in LA County, only a small fraction have COVID-19 outbreaks. Those that do are assisted by Public Health to mitigate spread.

Active COVID-19 Outbreaks in TK-12 Schools by Outbreak Site, Cases, and Contacts, Los Angeles County Department of Public Health, data through 26 SEP 2021

Site Date Outbreak Opened Outbreak Type # Student Cases # Staff Cases # Student Close Contacts # Staff Close Contacts
Eastside High School 2021-09-24 Youth Sports 5 1 96 0
Junipero Serra High School 2021-09-23 Youth Sports 3 0 0 0
Venice High School 2021-09-23 Youth Sports 9 0 0 0
Warren High School, Downey 2021-09-23 Youth Sports 3 0 0 0
Sylvan Park Elementary 2021-09-22 Classroom 4 0 20 0
Bellflower Middle/High 2021-09-21 Youth Sports 7 0 0 0
Pennekamp Elementary 2021-09-21 Classroom 7 1 20 0
Fairfax Senior High 2021-09-20 Youth Sports 8 0 29 1
Griffith Middle School STEM Magnet 2021-09-20 Classroom 2 1 0 0
Paramount High School 2021-09-17 Youth Sports 3 1 0 0
Leal Elementary School 2021-09-16 Classroom 9 1 41 2
Santa Clarita Elementary School 2021-09-16 Classroom 3 0 26 0
Nobel Charter Middle School 2021-09-15 Classroom 5 0 32 0
Olympic Primary Center 2021-09-15 Classroom 4 0 11 0
Sherman Oaks Center for Enriched Studies Magnet 2021-09-15 Classroom 7 0 18 0
Summerwind Elementary School, Palmdale 2021-09-15 Classroom 10 3 45 1
KIPP Pueblo Unido 2021-09-13 Classroom 6 0 26 0
La Ballona Elementary School 2021-09-10 Classroom 5 0 21 0
Palmdale High School 2021-09-10 Youth Sports 15 1 43 1
Saugus High School 2021-09-10 Youth Sports 15 0 142 0
Valley Beth Shalom Day School 2021-09-09 Classroom 9 1 44 8
Foothill Christian School, Glendora 2021-09-08 Classroom 11 2 38 0
Castaic High School 2021-09-02 Youth Sports 13 0 94 24
Hart High School 2021-09-02 Youth Sports 11 0 65 0
Rosedell Elementary North 2021-08-30 Classroom 9 3 33 5
Quartz Hill High School 2021-08-27 Youth Sports 12 0 34 2
  • Epidemiologically linked means that the cases were present at some point in the same setting during the same time while infectious.
  • Outbreaks that are active means that there has been at least one COVID-19 case that is epidemiologically linked to the outbreak cluster within the past 14 days.